Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV
Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV
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Date
2005-04
Authors
Zhu, L.Y.
Arrington, J.
Averett, T.
Beise, E.
Calarco, J.
Chang, T.
Chen, J.P.
Chudakov, E.
Coman, M.
Clasie, B.
Advisor
Citation
L. Y. Zhu et al. Physical Review C 71, no. 4 (2005): 044603(17).
DRUM DOI
Abstract
The differential cross sections for the γn→π-p and the γp→π+n processes were measured at Jefferson Lab. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles varied from 50° to 110°. The π- and π+ photoproduction data both exhibit a global scaling behavior at high energies and high transverse momenta, consistent with the constituent counting rule prediction and the existing π+ data. The data suggest possible substructure of the scaling behavior, which might be oscillations around the scaling value. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV. The differential cross section ratios [dσ/dt(γn→π-p)/dσ/dt(γp→π+n)] at high energies and high transverse momenta can be described by calculations based on one-hard-gluon-exchange diagrams.